CHICAGO – The FBI said on Thursday there was “absolutely no indication” of a terror attack threat in Chicago, although the city was considered a potential target even before President Barack Obama and other leaders meet for this weekend’s NATO summit.

FBI agent Ross Rice said the agency will be on heightened alert in Chicago, with extra agents brought in to react if its intelligence network sniffs out a plot. The FBI has agents in 70 countries, gathering intelligence.

“Several international terrorist groups have elevated Chicago in their mind to their No. 1 target for terrorist attack,” Rice said in an interview at the U.S. government’s nerve center inside a non-descript suburban Chicago office complex. Reporters were asked to keep the location secret.

“But there’s absolutely no indication that we’ve developed that any group or organization has a plan afoot to disrupt the summit this week,” Rice said.